Marc I have to agree with Bruce. My experience with Symbol devices is they do not play well with Cisco AP's. I have a Cisco LWAPP environment with a 4400 controller and we tried a few Symbol 8846's and MC70's as well and had lots of connectivity problems with them. We ended up changing to Intermec devices and our problems went away.
I don't beleive either that Symbol is certified for CCX whereas Intermec and Cisco have a good business relationship (so it seems)
Feel free to pm me off-line if you want more details.